With multiple investigators in our study, it is important to define the neonatal state uniformly. With this simple method of assessment, investigators expect the inter-observer agreement will be high. To estimate the inter-observer variability, the first 10 infants at each site (Total 30 infants for 3 sites) who are recruited into the study will be observed simultaneously by 2 investigators. Each observations will happen during the first 10 minutes of recordings (in the normal newborn nursery) and will be recorded independently by the investigators on preprinted forms.